Punching-machine



L. DUBOIS.

PUNCHING MACHINE.

APPLICATION FILED JULY 22. 1919.

Patented Nov. 30, 1920.

3 SHEETS-SHEET lllll TV I 5:5

20672 2 02 Jozz 2a 5 (Q wit 477w;

DUBOIS.

PUNCHING MACHINE.

APPLiCAfION FILED JULY 22. 1919.

Patented Nov. 30, 1920.

3 SHEETS-SHEET 2- @vcvzZor 6072 260606;?

L. DUBOIS.

PUNCHING MACHINE. APPLECATIONFILED JULY 22, I919.

Patented NOV. 30, 1920.

v 3 SHEETS-SHEET 3 PATENT OFFICE.

LEON DUIBOIS, OF ST. ETIENNE, FRANCE.

PUNCHIliTG-MACHINE.

Specification of Letters Patent. P t te 30 1 Application filed July 22, 1919. Serial No. 312,622.

T 0 all whom it may concern Be it known that I, LE'oN Donors, a citizen of the French Republic, residing in St. Etienne, France, have invented a certain new and useful Improved Punching-.Machine, of which the following is a specification. This invention has for its object a punchlng' machine operated by hand, which is adapted for punching sheet metals, profiled iron and tubes. It is of the kind having a carriagejsliding in a guideway for effecting the punching, punches of different sizes being mounted in a ring somewhat resembling the turret of a lathe and carried by the carriage.

For the purpose of allowing the punching of angle iron andthe like close to the'flange,

the punches are mounted eccentrically in sockets, which are embedded radially in the said ring close to one face thereof, and the matrix holder receives matrices correspond ing with the diameter of the punches and correspondingly eccentric. r

The guide-way is carried by the upper jaw of a U-shaped frame horizontally arranged; the lower jaw is adapted to carry different matrix holders accordingly as flat articles or tubes are to be punched.

There is thus obtained a light hand op erated tool capable of being used for the several purposes named.

Figure 1 shows the punching machine drawn to a reduced scale, the lower jaw be ing arranged forpunching sheet metal or angle iron, or iron bars of other section.

Fig. 2 shows the same machine having the lower jaw arranged for punching tubes.

The remaining figures show, drawn to a larger scale, the chief parts of the punching machine, that is to say Fig. 3 shows the end of the upper jaw carrying a punch holder which may be actuated by a lever or by a pinion.

Fig. 4 is a plan on the line 11 of Fig. 3, the lever having been removed' Fig. 5 is a front view of the upper jaw.

Fig. 6 is a side view of the end of the lower aw. 1 Fig. 7 is a plan of Fig. 6, the matrix holder having been removed.

Figs. 8 and 9 are plans of two matrix holders by means of which holes of different diameters may be unched;

'cated in dotted lines.

Fig. 10 is a longitudinal section drawn to a still larger scale of a socket for carrying a punch.

Fig. 11 is a transverse section on line 2-2 of Fig. 10.

-Fig. 12, also drawn to an enlarged scale, is an elevation of a matrix, and

Fig. 13 is an underside plan thereof.

The frame of the machine, forming two jaws, is made of two cheeks'of sheet metal a separated bydistance pieces and clamped together by bolts Z). The upper jaw carries fastened to the cheeks a guide-way c and two arms (Z forming a support for the operating lever 0,-the end of which is connected by a helical spring with a transverse bar carried by the cheeks; In the guideway slides a carriage g which constitutes the punch holder, the upper part of which is formed as a fork embracing the operating lever e and connected therewith by a pin. The perforations which accommodate this pin are repeated in the fork so that the point of suspension of the'carriage from the lever may be varied to modify the stroke of the carriage.

.At the lower part of the carriage is a nave on which is mounted a ring it carrying sockets 2' to receive the punches j, the position of which during the punching operation is accurately preserved, as is more particularly shown at the bottom of Fig. 3. To prevent any rotary movement of the sockets in their bearings, pins 10 are inserted in the ring. Vhen the ring has been turned into the position in which the punch should operate it is locked by a hand nut Z.

The ring here shown by way of example carries six punches but the number and the size of the punches may be varied.

As'shown in Figs. 10 and 11 the punches are mounted eccentrically in the sockets which are embedded radially in the ring h. This arrangement is for the purpose of per mitting in particular-the punching of special iron as is shown for instance in Fig. 1, where angle iron is being punched, as indi- V The eccentric posi tion of the punch allows of one side of the angle being punched very near the other side. To the same end the sockets h are mounted in the ring as near as possible to one face thereof.

Independently of the operating lever, the carriage may be operated by a rack on embedded in the carriage and engaging with a pinion a mounted in the jaw on an axle o extending through the aw; the endof this axle is adapted to receive a crank handle.

The cheeks a of the lower jaware also separated by a block y) constituting a table for the matrix holder 9; the latter .has dependingfrom its rear end a bolt 7*, the head holder. By means of a hand nut zf on the lower end of this bolt the matrix holder can be'fixed to the block. At the end of the matrix holder is fixed the matrix 24, the perforation throiwh which is eccentric to correspond with the eccentricity of the punch in its holder. A-pin u prevents rotation of the matrix.

As shown by way of example in Figs. 8

' and 9, the body part of the matrix holder is always the same, but the end which receives the matrix is modified according to the diameter Of the latter, the form of which is always that indicated in Figs. 12 and 13.

For punching tubes the lower jaw is equipped as shown in Fig. 2, the matrix holder is not required and instead .there is provided a cylindrical bar a, one end of which is flattened so as. to be adapted to be held in the jaw by a bolt extending through perforations w in the cheeks of the jaw. Several such perforations are provided in order that the bar may be 'fixed at a variable height to suit the diameter of the tube to be punched. At the other end of the bar is fixed a matrix as, under the same conditions as have been explained with reference to the matrix holder.

For this end the barhasla screw threaded hole which can be adjusted so as to insure a contact of the tube with the block pot the jaw, t-he'leng'th of the screw varying with the diameter of the tube. To hold the bar in position on thejaw a collar 2 on the form upper and lower jaw members, a

guide-way in the upper jaw member, a car riage slidablymounted insaid guideway, hand operated means adapted to slide the carriage to effect the punching, a ring carried on the carriage rotatable about .a horizontal axis and adapted'to be fixed in different angular positions, socket members embedded radially insaidring in proximity to one face thereof, punches mounted eccentrically in the said socket members close to said face,.and.mean-s carried by the lower jaw adapted .to different matrix holders thereon. V [1 In testimony whereof'I have signed my name to thisspecification.

LEQN .DUBOIS. [n s] W'itnesscs PONCHAUB, RoNzE. 

